Metascore
77

Generally favorable reviews - based on 11 Critics

Critic score distribution:
  1. Positive: 8 out of 11
  2. Negative: 0 out of 11
  1. Left 4 Dead minus the Zombies, plus a truckload of skittering aliens. Pure brilliance, and free to boot? Valve knows how to make their customers happy. Get to downloading it, stat!
  2. Minor quibbles aside, this is a must-play game for action gamers, especially those who enjoy playing cooperatively online.
  3. Totally free, and totally worth your time. [Oct 2010, p.65]
User Score
8.3

Generally favorable reviews- based on 400 Ratings

User score distribution:
  1. Positive: 61 out of 71
  2. Negative: 2 out of 71
  1. Aug 20, 2010
    10
    This game, while small, is a great game from Valve that's like a top down version of Left4Dead except with alien bugs. It runs on the SourceThis game, while small, is a great game from Valve that's like a top down version of Left4Dead except with alien bugs. It runs on the Source engine and enables people to make their own maps which is a plus. I like how weapons are unlockable but the default weapons still can stand a good chance against enemies on higher difficulties. Overall, it's free and I can't think of a reason not to buy it! Valve sure knows how to cater it's fans with free little gems like this game. Full Review »
  2. Nov 10, 2011
    7
    "Alien Swarm" is a suprisingly fun 4 player co-op game with tons of stuff to do. You will have a good time upgrading and choosing characters"Alien Swarm" is a suprisingly fun 4 player co-op game with tons of stuff to do. You will have a good time upgrading and choosing characters and weapons to use for your battle with alien bugs. Oh and btw...It's Free. Full Review »
  3. Aug 27, 2010
    10
    Raw, free awesome. Make sure to play with people you are at least a little before going on modes harder than normal. Highest difficulty isRaw, free awesome. Make sure to play with people you are at least a little before going on modes harder than normal. Highest difficulty is where to go if you want a challenge and actual tactics. Also, expect to die on the harder modes at least as you first start out when you get better it becomes epic. Full Review »